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MH 22 and 30 head interchangability????

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Justin

08-16-2002 20:18:30




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Are the heads the same on these engines? I know most of all the internal parts are.




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Adam

08-18-2002 19:18:24




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 Re: MH 22 and 30 head interchangability???? in reply to Justin, 08-16-2002 20:18:30  
What about where distributor is . I thought it was in the middle of the head on the 30 and somewhere else on the 22.



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Alberta Mike

08-19-2002 07:04:41




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 Re: Re: MH 22 and 30 head interchangability???? in reply to Adam , 08-18-2002 19:18:24  
I've got some pictures here of a MH22 with the hood off and the distributor is coming right out of the top of the cylinder head, dead center. I have seen Continentals without a distributor ignition and in those cases, the opening in the head is plugged off and the magneto is mounted to the right front of the engine.



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Alberta Mike

08-17-2002 14:16:54




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 Re: MH 22 and 30 head interchangability???? in reply to Justin, 08-16-2002 20:18:30  
I believe the model 30 used the 162 cubic inch version of that Continental 4 cylinder flathead while the model 22 used the 140 cubic inch version. Only the cylinder bore size is different and probably the heads are a bit different too above the piston. Are you positive that the engines in the two tractors are the original ones, they might have been transplanted at some time in the past. That engine came in 3 sizes ... 124, 140, and 162 cubic inches. I know that I used a 140 head (bigger bore size) on a 124 a few years ago and it works fine. Whether or not you could put a head from a small version on a big version I don't know, the smaller combustion chamber in the head might make the compression ratio too high. Check to see if the diameter of the combustion chamber in the head is close to each other (above the piston), they should be pretty close. The valves and their combustion head clearances should not be a problem.

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justin

08-17-2002 14:23:02




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 Re: Re: MH 22 and 30 head interchangability???? in reply to Alberta Mike, 08-17-2002 14:16:54  
The head is from a 30. I was wantin to know if it would fit my dad's budy's 22. His head rotted out. And this one has a good price tag. I thought all they did was change the bore on the F400 series. But wasnt sure.



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Alberta Mike

08-18-2002 05:38:27




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 Re: Re: Re: MH 22 and 30 head interchangability???? in reply to justin, 08-17-2002 14:23:02  
If the head is from the MH 30 and both engines were original, then you're transplanting a head from a 162 to a 140 cubic inch engine which should be OK. Like I mentioned, I used a 140 head on a 124 block (in a MH 101 Junior) and it worked fine. Actually at the time, I didn't even give it any thought with regards to size. There is 1/4" difference in bore size diameter between your two heads, 3 7/16" in the 162 vs 3 3/16" in the 140.

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Tom

08-19-2002 20:21:37




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 Re: Re: Re: Re: MH 22 and 30 head interchangability???? in reply to Alberta Mike, 08-18-2002 05:38:27  
The difference can be noted in the depth of the combustion chamber measured from the heads deck to the roof (flat portion of combustion chamber)with a depth mike or good scale. What we did at the Continental was to buy basically one cyl. head casting and machine the head to different depth chambers to achieve the correct comp. ratio for any given cyl. bore size. If the engine was a small bore the chambers were made smaller and the cut on the top was not as great so that the total height of the head was the same and other operations were of correct reference ie. distributor hole and water outlet pad height etc. When you measure to compare the two heads measure one of the end chambers, those are the ones we targeted from.

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